This is a genuine AAM pinion seal kit that includes the pinion seal, pinion sleeve, pinion nut, and pinion washer. This fits 1998 and newer GM trucks trucks with the 8.6 American Axle Manufacturing rear differential. This includes 1/2 ton trucks, Tahoes, and Suburbans. These differentials have a 10 bolt rear cover. Shipping is FAST and FREE in the continental U.S.